oracle rac安装时候选项跳不出来？

centos7.8环境里面安装11g rac的时候，看不到选项。点了next之后一直在那个界面转圈圈，正常的话这里好像是要跳出个选项框让我再点一下。反正就是没法进行下一步了。强制结束了再安装还是卡到这里。如下图：

错误日志如下：
ERROR: rac-cluster: rac-cluster

java.net.UnknownHostException: rac-cluster: rac-cluster

at java.net.InetAddress.getAllByName0(InetAddress.java:1145)

at java.net.InetAddress.getAllByName(InetAddress.java:1072)

at java.net.InetAddress.getAllByName(InetAddress.java:1008)

at java.net.InetAddress.getByName(InetAddress.java:958)

at oracle.install.ivw.crs.validator.CRSValidationHelper.validateSCANVIP(CRSValidationHelper.java:660)

at oracle.install.ivw.crs.validator.ClusterInfoValidator.validate(ClusterInfoValidator.java:96)

at oracle.install.commons.flow.validation.ValidationHelper.validateState(ValidationHelper.java:178)

at oracle.install.commons.flow.AbstractFlowExecutor.validate(AbstractFlowExecutor.java:394)

at oracle.install.commons.flow.AbstractFlowExecutor.leaveVertex(AbstractFlowExecutor.java:607)

at oracle.install.commons.flow.AbstractFlowExecutor.transition(AbstractFlowExecutor.java:321)

at oracle.install.commons.flow.AbstractFlowExecutor.nextState(AbstractFlowExecutor.java:261)

at oracle.install.commons.flow.AbstractFlowExecutor.nextViewState(AbstractFlowExecutor.java:220)

at oracle.install.commons.flow.DefaultFlowNavigator.goForward(DefaultFlowNavigator.java:58)

at oracle.install.commons.flow.jewt.FlowWizard$1.run(FlowWizard.java:72)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)

at java.lang.Thread.run(Thread.java:595)